HTML5 canvas game 4 questions

Hi everyone!

It's been a whilte since I made a game in Adobe (Flash sadface) now Animate.

I could have sworn back in the day the code to create a variable was

var varName = 1;

Question 1) I want to have var equal to a number would that be correct?

Question 2) If I had a button in a movieclip and I wanted that number to go up +1, would this be the code:

exportRoot.varName ++;

Question 3) If I wanted to do a if/then code if the variable got up to 3 or more.. would it be:

if varName >= 3 {

doSomething;

}

Question 4) Is there a list of Adobe Animate ActionScript codes for HTML5 canvas games somewhere that I can look at?

Thanks ahead,

Line